Stop using legacy syntax for parameters on triggerRemoteJob (#4031)

Author: jsoriano

.ci/Jenkinsfile

@@ -350,7 +350,9 @@ def packageStoragePublish() {
         triggerRemoteJob(auth: CredentialsAuth(credentials: 'local-readonly-api-token'),
           job: 'https://internal-ci.elastic.co/job/elastic+unified-release+master+sign-artifacts-with-gpg',
           token: TOKEN,
-          parameters: "gcs_input_path=${env.INFRA_SIGNING_BUCKET_ARTIFACTS_PATH}",
+          parameters: [
+            gcs_input_path: env.INFRA_SIGNING_BUCKET_ARTIFACTS_PATH,
+          ],
           useCrumbCache: false,
           useJobInfoCache: false)
       }
@@ -373,11 +375,11 @@ def packageStoragePublish() {
             triggerRemoteJob(auth: CredentialsAuth(credentials: 'local-readonly-api-token'),
               job: 'https://internal-ci.elastic.co/job/package_storage/job/publishing-job-remote',
               token: TOKEN,
-              parameters: """
-                dry_run=false
-                gs_package_build_zip_path=${env.PACKAGE_STORAGE_INTERNAL_BUCKET_QUEUE_PUBLISHING_PATH}/${packageZip}
-                gs_package_signature_path=${env.PACKAGE_STORAGE_INTERNAL_BUCKET_QUEUE_PUBLISHING_PATH}/${packageZipSig}
-                """,
+              parameters: [
+                dry_run: false,
+                gs_package_build_zip_path: "${env.PACKAGE_STORAGE_INTERNAL_BUCKET_QUEUE_PUBLISHING_PATH}/${packageZip}",
+                gs_package_signature_path: "${env.PACKAGE_STORAGE_INTERNAL_BUCKET_QUEUE_PUBLISHING_PATH}/${packageZipSig}"
+              ],
               useCrumbCache: true,
               useJobInfoCache: true)
           }
@@ -395,4 +397,4 @@ def isAlreadyPublished(packageZip) {
     echo "Package Registry HTTP status code for ${packageZip}: ${responseCode}"
   }
   return responseCode == 200
-}
+}